Yes, exactly my thoughts - and they seem to use lower spec hardware leading to a perceivable delay between scanning -> putting on to weighing station -> able to scan next product.

Unless this is as designed too, for whatever reason, but this is what stops me from using them as I get frustrated.

The other thing that stops me from using them specifically in Lidl is that you cannot put a hazelnut croissant and an almond croissant in the same paper bag unless you take one out before you put it to weigh.